Sure, you could use IR and have it shutdown with one button. That's easy. The thing is you have to remember to do that, and (if you have an inverter) remember to shut that off whenever you get out of the car. It gets old after a while :( Not to mention it's kinda of ghetto. A system that turn on and off WITH the car is what we ultimately want. No fussing around with switches constantly and having to think about it.